People saying “he should have opted out” are missing the point. OpenAI can and should check their training data for leakage in the face of big breakthroughs like these. It’s the burden of the author to appropriately cite their sources.

It’s like a scientist refusing to give another one credit and say “sucks to be you, you shouldn’t have shared your idea with me”.

We checked and determined it was impossible for Dr. Buckmaster’s Codex prompts over the last two months to have influenced the system in any way, including training.

If prompts were submitted earlier than that and training was not opted out, there's a chance they made their way into our training pipeline in some form. But this would be a droplet in an ocean and unlikely to have made any difference, imo.

See: https://www.nytimes.com/2026/09/10/science/tristan-buckmaste...